Ruth, diatomaceous earth has been discussed and recommended many, many times on the forum. Below is an excerpt from a post a I made a while back.
A product by the name of 100% Food Grade Diatomaceous Earth is one of the best parasite destroyers on the market, and it’s safe to take longer than 30 days. An herb to help improve the effectiveness diatomaceous earth is yucca root.
By “parasites” I’m talking about protozoa, fungi, endotoxins, pesticides, viruses, drug residues, E-Coli. In addition, it also helps to remove toxins and heavy metals from the body.
Be sure that it reads “Food Grade” on the label.